Class 9, CBSE (NCERT) Science
Chapter-2, Is Matter Around Us Pure
Sample Important Questions
Q.1: How can matter be classified on the basis of its chemical constitution?
Q.2: How will you obtain pure copper sulphate from an impure sample?
Q.3: What should be the minimum difference in temperature between the boiling points of two miscible liquids that these can be separated by simple distillation method?
Q.4: Name the material which shows the average properties of the constituents contained in it.
Q.5: Define with example: (a) Mixture (b) Metalloid (c) Compound
Q.6: What are ‘fractionating column’ and ‘fractional distillation’?
Q.7: Give two important industrial applications of fractional distillation.
Q.8: Name the separating processes for the following:
(a) A solid substance dissolved in a liquid.
(b) Fine insoluble particles suspended in a liquid.
(c) Salt from sea water.
(d) Three different coloured solid substances soluble in a mixture of solvents.
(e) Two immiscible liquids.
(f) Two immiscible liquids having 10OC difference in their boiling points.
(g) Mixture of Nitrogen and Helium gases.
Q.9: How is air separated from its constituents?